#include <stdio.h>

long n,a[2000000],i,k=1;

int main ()
{
	freopen("scmax.in","r",stdin);
	freopen("scmax.out","w",stdout);
	scanf("%ld\n", &n);
	for(i=1;i<=n;i++) scanf("%ld", &a[i]);
	for(i=1;i<n;i++)
		if(a[i+1]-a[i]>0&&a[i]!=a[i-1]) 
		{
			k++;
			i++;
		}
		else a[i]=0;
	if(a[n]-a[k]>0) k++;
	printf("%ld\n", k);
	for(i=1;i<=n;i++) 
		if (a[i]!=0) printf("%ld ", a[i]);
	return 0;
}